content: package org.alien4cloud.tosca.editor.processors.nodetemplate.outputs;
  
  import alien4cloud.exception.NotFoundException;
  import org.alien4cloud.tosca.model.Csar;
  import org.alien4cloud.tosca.model.definitions.IValue;
  import org.alien4cloud.tosca.model.templates.NodeTemplate;
  import org.alien4cloud.tosca.model.templates.Topology;
  import alien4cloud.utils.AlienUtils;
  import com.google.common.collect.Maps;
  import com.google.common.collect.Sets;
  import lombok.extern.slf4j.Slf4j;
  import org.alien4cloud.tosca.editor.EditionContextManager;
  import org.alien4cloud.tosca.editor.operations.nodetemplate.outputs.SetNodeAttributeAsOutputOperation;
  import org.alien4cloud.tosca.editor.processors.nodetemplate.AbstractNodeProcessor;
  import org.springframework.stereotype.Component;
  
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Set a given attribute of a node as output for the topology.
   */
  @Slf4j
  @Component
  public class SetNodeAttributeAsOutputProcessor extends AbstractNodeProcessor<SetNodeAttributeAsOutputOperation> {
  
      @Override
      protected void processNodeOperation(Csar csar, Topology topology, SetNodeAttributeAsOutputOperation operation, NodeTemplate nodeTemplate) {
  
          // check if the attribute exists
          Map<String, IValue> attributes = nodeTemplate.getAttributes();
          if (!AlienUtils.safe(attributes).containsKey(operation.getAttributeName())) {
              throw new NotFoundException("Attribute " + operation.getAttributeName() + "not found in node template " + operation.getNodeName() + ".");
          }
  
          Map<String, Set<String>> outputs = topology.getOutputAttributes();
          if (outputs == null) {
              outputs = Maps.newHashMap();
          }
  
          if (outputs.containsKey(operation.getNodeName())) {
              outputs.get(operation.getNodeName()).add(operation.getAttributeName());
          } else {
              outputs.put(operation.getNodeName(), Sets.newHashSet(operation.getAttributeName()));
          }
  
          topology.setOutputAttributes(outputs);
  
          log.debug("Set node [ {} ]'s attribute [ {} ] as output for the topology [ {} ].", operation.getNodeName(), operation.getAttributeName(), topology.getId());
      }
  
  }